Abstract
The reduction of wall thickness of turbine blades brings coating systems into focus with a high oxidation resistance and mechanical strength at high temperatures. Therefore a multi-layer coating with a nominal composition of 77Pt–12Al–6Cr–5Ni (at.%) was applied to single crystal Ni-based superalloy CMSX-4 substrates by electron beam physical vapor deposition. The multi-layer structures were homogenized at 800–1000°C under continuous argon/2%-hydrogen gas flow for various times. Microstructures were investigated using scanning electron microscopy and transmission electron microscopy. Phase compositions were determined using energy dispersive X-ray spectroscopy in scanning and transmission electron microscopy. The coatings transformed into two phase microstructure with a fcc γ-phase and a L12 ordered γ′-phase during annealing.
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